Definition
Infrastructure as Code (IaC) is the practice of managing and provisioning IT infrastructure through machine readable definition files, rather than physical hardware configuration or interactive configuration tools. This approach treats infrastructure like software, allowing for version control, automated testing, and repeatable deployments. IaC enables teams to define servers, networks, databases, and other infrastructure components in code, which is then executed by specialized tools to build and manage the environment. This automation significantly reduces manual errors, speeds up deployment cycles, and ensures consistency across different environments, making it a cornerstone of modern DevOps practices. For instance, a cloud team might use Terraform to define and provision a complete AWS environment, including virtual machines, load balancers, and security groups, from a single set of code files. While IaC automates infrastructure provisioning, it is distinct from configuration management tools which focus on managing the state of existing infrastructure. Understanding IaC is crucial for roles involving cloud computing, system administration, and DevOps, and it is a key concept in certifications like AWS Certified Solutions Architect Associate and CompTIA Cloud+.